Thanks Jim, you saved me the cost of a certificate, I should have checked. Radcliffe, many thanks too. I think that St Mary's is Catholic but the baptism record that I checked is C 0f E. The other spelling may be of help, so far I have Kaanan, Duncan, Duncannon, Domcannon, Dunkin, Donkin, etc, etc. Onwards and upwards!
There is a private John Kaanan who died in India in 20 March 1811, HM Royal Regiment, maybe this is him? Work to do.
Thanks again
Sucher